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Unit 8
Test Description: Momentum
Instructions: Answer all questions to get your test result.
1) In mechanical systems, a large reduction in momentum is accomplished without damage to the machinery by
A
reducing the momentum to zero in the longest possible time
B
applying a large stopping force for a short time
C
reducing the momentum to zero in the shortest amount of time
D
slowing down the machinery in the shortest amount of time
2) The law of conservation of momentum tells us that in an isolated system:
A
the kinetic energy before an interaction equals the kinetic energy after the interaction
B
the total momentum before an interaction is greater than the total momentum after the interaction
C
the total momentum before an interaction equals the total momentum after the interaction
D
the velocity before an interaction equals the velocity after the interaction
3) An object's momentum tells us mostly about
A
the amount of motion the object has
B
the potential energy the object has
C
the physical size of the object
D
the specific gravity of the object
4) What are the metric units for momentum?
A
kg/m sec
B
kgm/sec
C
kg m sec
D
slug ft/ sec
5) L mom =
A
m times I
B
I + w
C
mr^2
D
I times w
6) The linear impulse of a 10 lb force acting on an object for 5 seconds is what
A
2 lb sec
B
0 lb sec
C
50 lb sec
D
0.5 lb sec
7) Which of the following will give you the full and correct information about a rotating object's angular momentum
A
mass and radius
B
moment of inertia and angular velocity
C
linear momentum and specific gravity
D
mass and angular velocity
8) When a golf ball is hit, the linear impulse involved is the product of the force applied by the club to the ball and
A
the time the club is in contact with the ball
B
the mass of the golf club
C
the distance the ball moves
D
the mass of the golf ball
9) Momentum is what kind of quantity
A
scalar
B
neither
C
vector
D
both
10) A linear force applied to an object for a period of time is called
A
linear impulse
B
linear momentum
C
angular momentum
D
angular impulse
*select an answer for all questions
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